package com.xgp.add;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {
    public static void main(String[] args) {
        //线程数量：停车位      限流！
        Semaphore semaphore = new Semaphore(3);
        for(int i = 1;i <= 6;i++) {
            new Thread(() -> {
                //等到
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName() + "抢到车位");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName() + "离开车位");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    //释放
                    semaphore.release();
                }
            }).start();
        }
    }
}
